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    Specs, parts for maze runner robot (school project)

    Hi All,

    I would like to build a robot like in the following video. Please advice first to buy motors

    Motor Voltage
    Motor RPM
    Motor Diver

    I am expecting use ARDUINO MEGA board

    Thanks in advance

    - - - Updated - - -

    Dear All I found following motor link in the search of internet please advice

    Please advice is this correct motor for grid follower

    https://www.pololu.com/product/3056

    •   Alt16th July 2016, 10:59

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    re: Specs, parts for maze runner robot (school project)

    I had a storebought line follower robot kit. The motors were 3V, powered from two AA cells. Size about 1 inch by 1 inch.

    The motors spun very quickly. To reduce the speed, they needed a gear train consisting of 5 small plastic gears.

    - - - Updated - - -

    Only one motor ran at a time. First one motor, then the other, several times a second.

    The motors need to start and stop very quickly. Therefore they should be small.


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    •   Alt16th July 2016, 18:21

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    re: Specs, parts for maze runner robot (school project)

    Motor torque and RPM need to match, the work being done for proper sizing.
    Weight, acceleration, speed.

    Stall current will be your starting current and this will drop to idle current at full speed if there is no friction, otherwise higher.
    Once you choose motor power and time duration, energy required between charging, you can choose battery size which you include in initial weight. then, you choose RPM desired and actual under load with wheel circumference and RPM. Without motor torque vs RPM and Robot mass and friction load, you have to estimate when they are equal as this determines maximum RPM.

    After this is selected, with battery energy in Watt-hours , you can now choose voltage of batteries to match best options for motor. Higher voltage allows for lower conduction losses in conductors and drivers.

    So make a list of specs and inputs & outputs as much as possible, including processes of speed control, acceleration steering and median differential sensor for tracking , optical or magnetic or RF line.

    This is how design works. Top down approach. The result is you can then test vs estimate of performance to see if design meets goals.

    It can be a simple result or complex as only you choose the performance by values of the tasks for energy, velocity, weight, acceleration, and time.
    A good design question lists your overall requirements™ The best question deserves a better answer. ™
    ... Tony Stewart EE since 1975


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    •   Alt16th July 2016, 19:15

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    re: Specs, parts for maze runner robot (school project)

    Dear All,

    We have received the guild lines for the competition
    Please find the attached for the image
    It would be much appreciated if some one can advice on following

    Motor RPM
    Motor Voltage
    Sensor type ( Ultrasonic / Wall / Ir....)
    Motor Type ( Stepper Motor or DC Motor)
    Click image for larger version. 

Name:	PlayField.JPG 
Views:	2 
Size:	411.8 KB 
ID:	130805

    Please advice what kind of parts should most recommend for above type of competition

    All reply and helps are highly welcome

    Thanks in advance
    Last edited by pasidu; 18th July 2016 at 11:53.



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    Re: Specs, parts for maze runner robot (school project)

    This project is more difficult than a line follower robot. Naturally you want to run the maze quickly. Reasonable robot size is 10 inches wide (say half the width of the maze passages). An easy place to learn what sort of equipment could work, is a radio controlled model car, truck, etc.

    If you can make your steering able to turn sharply, then you may get by with a single drive motor for two wheels (probably the front wheels), while a single wheel steers (at the rear).

    You do not require extreme speed. A 6V or 12V supply is sufficient. Perhaps all motors need to turn off at times. It might help to be able to change motor speed, perhaps reverse direction.


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    •   Alt18th July 2016, 16:30

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    Re: Specs, parts for maze runner robot (school project)

    Dear BratheRed Thanks for the advice and reply

    I sow Youtube maze competition that maze run absolute pass so they could not use steering

    what do you think about encoded motors advantage and disadvantage

    I suppose to use, the motors in the following link but some are saying that motors isn't good

    https://www.google.lk/search?q=ardui...pfOgo5wz9pM%3A

    Please advice



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    Re: Specs, parts for maze runner robot (school project)

    By encoded I suppose you mean stepper motors? That type of motor might give you the easiest means to measure position. Count pulses to the motor. The logic network needs to remember how far forward or backward you drove. It is easier with stepper motors, but not so easy when you drive with ordinary DC motors.

    Locomotion might not be as difficult as the sensors, however. The guidelines seem to indicate that your sensor method needs to detect walls at close range. Also the doorways. This will be a challenge.


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